1256462251 has 4 divisors (see below), whose sum is σ = 1370686104. Its totient is φ = 1142238400.

The previous prime is 1256462237. The next prime is 1256462287. The reversal of 1256462251 is 1522646521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1522646521 = 11 ⋅138422411.

It is a cyclic number.

It is not a de Polignac number, because 1256462251 - 2¹¹ = 1256460203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1256462351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57111910 + ... + 57111931.

It is an arithmetic number, because the mean of its divisors is an integer number (342671526).

Almost surely, 2^1256462251 is an apocalyptic number.

1256462251 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1256462251 is a deficient number, since it is larger than the sum of its proper divisors (114223853).

1256462251 is a wasteful number, since it uses less digits than its factorization.

1256462251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114223852.

The product of its digits is 28800, while the sum is 34.

The square root of 1256462251 is about 35446.6112766792. The cubic root of 1256462251 is about 1079.0704882455.

The spelling of 1256462251 in words is "one billion, two hundred fifty-six million, four hundred sixty-two thousand, two hundred fifty-one".